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          <h1 class="post-title" itemprop="name headline">生成订单号</h1>
        

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        <blockquote>
<p>生成订单号<br><a id="more"></a></p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span 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class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.jsz.peini.common.util;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.math.BigDecimal;</span><br><span class="line"><span class="keyword">import</span> java.text.SimpleDateFormat;</span><br><span class="line"><span class="keyword">import</span> java.util.Date;</span><br><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"><span class="keyword">import</span> java.util.concurrent.atomic.AtomicInteger;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * 流水号生成器</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@version</span> v1.0</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> wgl</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SNUtil</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> String str62 = <span class="string">"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"</span>;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> <span class="keyword">int</span> pixLen = <span class="number">36</span>;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> <span class="keyword">int</span> pixOne = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> <span class="keyword">int</span> pixTwo = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> <span class="keyword">int</span> pixThree = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">volatile</span> <span class="keyword">int</span> pixFour = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> AtomicInteger ATOM_INT = <span class="keyword">new</span> AtomicInteger(<span class="number">0</span>);</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">int</span> MAX_36 = <span class="number">36</span> * <span class="number">36</span> * <span class="number">36</span> * <span class="number">36</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 生成短时间内不会重复的长度为15位的字符串。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 生成策略为获取自1970年1月1日零时零分零秒至当前时间的毫秒数的16进制字符串值，该字符串值为11位&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 并追加四位"0-z"的自增字符串.&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 如果系统时间设置为大于&lt;b&gt;2304-6-27 7:00:26&lt;b/&gt;的时间，将会报错！&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 由于系统返回的毫秒数与操作系统关系很大，所以本方法并不准确。本方法可以保证在系统返回的一个毫秒数内生成36的4次方个（1679616）ID不重复。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 经过测试：该方法效率 比 create15_2 方法快一倍</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> 15位短时间不会重复的字符串。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@since</span> JDK1.6</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">static</span> <span class="keyword">synchronized</span> String <span class="title">create15</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder(<span class="number">15</span>);<span class="comment">// 创建一个StringBuilder</span></span><br><span class="line">        sb.append(Long.toHexString(System.currentTimeMillis()));<span class="comment">// 先添加当前时间的毫秒值的16进制</span></span><br><span class="line">        pixFour++;</span><br><span class="line">        <span class="keyword">if</span> (pixFour == pixLen) &#123;</span><br><span class="line">            pixFour = <span class="number">0</span>;</span><br><span class="line">            pixThree++;</span><br><span class="line">            <span class="keyword">if</span> (pixThree == pixLen) &#123;</span><br><span class="line">                pixThree = <span class="number">0</span>;</span><br><span class="line">                pixTwo++;</span><br><span class="line">                <span class="keyword">if</span> (pixTwo == pixLen) &#123;</span><br><span class="line">                    pixTwo = <span class="number">0</span>;</span><br><span class="line">                    pixOne++;</span><br><span class="line">                    <span class="keyword">if</span> (pixOne == pixLen) &#123;</span><br><span class="line">                        pixOne = <span class="number">0</span>;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.append(str62.charAt(pixOne)).append(str62.charAt(pixTwo)).append(str62.charAt(pixThree)).append(str62.charAt(pixFour))</span><br><span class="line">                .toString();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="meta">@SuppressWarnings</span>(<span class="string">"unused"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">static</span> String <span class="title">create15_2</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder(<span class="number">15</span>);</span><br><span class="line">        sb.append(Long.toHexString(System.currentTimeMillis()));</span><br><span class="line">        ATOM_INT.compareAndSet(MAX_36, <span class="number">0</span>);</span><br><span class="line">        String str = longTo36(ATOM_INT.incrementAndGet());</span><br><span class="line">        <span class="keyword">if</span> (str.length() == <span class="number">1</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"000"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (str.length() == <span class="number">2</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"00"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (str.length() == <span class="number">3</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"0"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            sb.append(str);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 生成短时间内不会重复的长度为16位的字符串。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 生成策略为获取自1970年1月1日零时零分零秒至当前时间的毫秒数的16进制字符串值，该字符串值为11位&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 并追加四位"0-z"的自增字符串.&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 如果系统时间设置为大于&lt;b&gt;2304-6-27 7:00:26&lt;b/&gt;的时间，将会报错！&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 由于系统返回的毫秒数与操作系统关系很大，所以本方法并不准确。本方法可以保证在系统返回的一个毫秒数内生成36的4次方个（1679616）ID不重复。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * 经过测试：该方法效率 比 create15_2 方法快一倍</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> 15位短时间不会重复的字符串。&lt;br/&gt;</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@since</span> JDK1.6</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="meta">@SuppressWarnings</span>(<span class="string">"unused"</span>)</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">static</span> String <span class="title">create16Years</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder(<span class="number">15</span>);</span><br><span class="line">        sb.append(<span class="keyword">new</span> SimpleDateFormat(<span class="string">"yyMMddHHmmss"</span>).format(<span class="keyword">new</span> Date()));</span><br><span class="line">        ATOM_INT.compareAndSet(MAX_36, <span class="number">0</span>);</span><br><span class="line">        String str = longTo36(ATOM_INT.incrementAndGet());</span><br><span class="line">        <span class="keyword">if</span> (str.length() == <span class="number">1</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"000"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (str.length() == <span class="number">2</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"00"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (str.length() == <span class="number">3</span>) &#123;</span><br><span class="line">            sb.append(<span class="string">"0"</span>).append(str);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            sb.append(str);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.toString();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 10进制转任意进制</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> num Long型值</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> base 转换的进制</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span> 任意进制的字符形式</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> String <span class="title">ten2Any</span><span class="params">(<span class="keyword">long</span> num, <span class="keyword">int</span> base)</span> </span>&#123;</span><br><span class="line">        StringBuilder sb = <span class="keyword">new</span> StringBuilder(<span class="number">7</span>);</span><br><span class="line">        <span class="keyword">while</span> (num != <span class="number">0</span>) &#123;</span><br><span class="line">            sb.append(str62.charAt((<span class="keyword">int</span>) (num % base)));</span><br><span class="line">            num /= base;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> sb.reverse().toString();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 将一个Long 值 转换为 62进制</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@param</span> num</span></span><br><span class="line"><span class="comment">     * <span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> String <span class="title">longTo62</span><span class="params">(<span class="keyword">long</span> num)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> ten2Any(num, <span class="number">62</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> String <span class="title">longTo36</span><span class="params">(<span class="keyword">long</span> num)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">return</span> ten2Any(num, <span class="number">36</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">    	<span class="keyword">long</span> begin = System.currentTimeMillis();</span><br><span class="line">		<span class="keyword">int</span> repeat = <span class="number">0</span>;</span><br><span class="line">		<span class="keyword">int</span> times = <span class="number">10000</span>;</span><br><span class="line">		Map&lt;String, Object&gt; store = <span class="keyword">new</span> HashMap&lt;String, Object&gt;();</span><br><span class="line">		String no = <span class="keyword">null</span>;</span><br><span class="line">		<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; times; i++) &#123;</span><br><span class="line">			<span class="comment">//no =  create15();</span></span><br><span class="line">			<span class="comment">//no =  create15_2();</span></span><br><span class="line">			no = create16Years();</span><br><span class="line">			<span class="keyword">if</span>(store.containsKey(no))&#123;</span><br><span class="line">				repeat++;</span><br><span class="line">			&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">				store.put(no, <span class="number">1</span>);</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="keyword">if</span>(i==times-<span class="number">1</span>)&#123;</span><br><span class="line">				System.out.println(no);</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">long</span> end = System.currentTimeMillis();</span><br><span class="line">		System.out.println(<span class="string">"测试getBigOrderCode 重复概率:"</span>);</span><br><span class="line">		System.out.println(<span class="string">"测试次数:"</span>+times);</span><br><span class="line">		System.out.println(<span class="string">"重复次数:"</span>+repeat);</span><br><span class="line">		System.out.println(<span class="string">"重复概率:"</span>+( <span class="keyword">new</span> BigDecimal(repeat).divide(<span class="keyword">new</span> BigDecimal(times)) ) );</span><br><span class="line">		System.out.println(<span class="string">"测试耗时:"</span>+(end-begin));</span><br><span class="line">	&#125;</span><br><span class="line">    </span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">SNTester</span> <span class="keyword">implements</span> <span class="title">Runnable</span></span>&#123;</span><br><span class="line">	</span><br><span class="line">	<span class="keyword">static</span> Map&lt;String, Object&gt; store = <span class="keyword">new</span> HashMap&lt;String, Object&gt;();</span><br><span class="line">	<span class="keyword">int</span> times = <span class="number">2000</span>;</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		Map&lt;String, Object&gt; store = <span class="keyword">new</span> HashMap&lt;String, Object&gt;();</span><br><span class="line">		String no = <span class="keyword">null</span>;</span><br><span class="line">		<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; times; i++) &#123;</span><br><span class="line">			no =  SNUtil.create15();</span><br><span class="line">			<span class="keyword">if</span>(store.containsKey(no))&#123;</span><br><span class="line">				<span class="comment">//repeat++;</span></span><br><span class="line">			&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">				store.put(no, <span class="number">1</span>);</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="keyword">if</span>(i==times-<span class="number">1</span>)&#123;</span><br><span class="line">				System.out.println(no);</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">		</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<blockquote class="blockquote-center">今天最好的表现，是明天最低的要求。</blockquote>
      
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